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Rubber Ball Mill Liner Wear Rate Estimation (4 replies)

9 months ago
Oberfuhrer 9 months ago

What formulation should I use for the estimated calculation of rubber type mill liners wear rate?

9 months ago
Amar 9 months ago

Rubber lining since a newer technology and population is still limited it is a proprietary item and design calculation shall be available with the manufacturer only. However some text book reference is available with METSO mill lining solution web page.

Jean Rasczak
9 months ago
Jean Rasczak 9 months ago

The wear rate on rubber mill liners (in fact most if not all types of liners) is a function of ore type and PSD, media type and size distribution, mill filling level, speed and operational up-time. I am not aware of a universal formulation to calculate expected wear life. Typically in wet mineral ball mills we see a life time of 2 years (under continuous operation)

Paul Morrow
9 months ago
Paul Morrow 9 months ago

The best advice I can give is to first consult the vendor/manufactory then measure wear each time the mill is shut down for maintenance. From this calculate the expected time to end of life. Further it is advisable to allocate funds and notify vendor at least when expected life is twenty five percent of total or six months, whichever comes first. This will avoid delays of production and much frustration. Also makes the accountants happy which is not a bad thing.

Sandeep Bisht
9 months ago
Sandeep Bisht 9 months ago

With thousands of wet grinding mills running with Rubber Lining and data available with us on mills lined by us; an approximation on expected life can be drawn. Key comparison points being Mill diameter, Media size, Mill speed and Tonnage handled.

The abrasion index of Rubber may vary with changes in these parameters.
Secondary Grinding Ball Mills experience 1-2 years of liner life, depending on tonnage/ball size. Normally Lifter to Plate ratio is 1:2.Tertiary Grinding Ball Mills experience up to 4 years of liner life.

Since, all the mills are unique in their operation and the practical sense in which they run, we do wear measurement during every shutdown. From the readings, a Wear profile is plotted and a series of these inspections give us very close liner life estimation. This also helps in re-designing the lining for higher life by addressing the weak zones. It is like a medical history of the liners. 

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